(OILPRICE) — Tokyo Electric Power Co. (TEPCO) lied about the dangers of radiation exposure, according to eight US sailors involved in disaster relief operations following the March 2011 Fukushima meltdown.

Now the sailors are suing the Japanese company—the owner of the power plant that ended in the world’s biggest nuclear disaster since Chernobyl.

The sailors were on board the USS Ronald Reagan nuclear-powered aircraft carried that helped with disaster relief, and they claim that TEPCO purposefully lied about the dangers of radiation exposure in order to ensure disaster relief after the earthquake and tsunami that led to a nuclear meltdown.